Device for soldering band-saws.



J. ROHRER. DEVICE FOR SOLDEBING BAND SAWS. APPLICATION rnnn nno.1e,1aoa.

988,820. Patented Apr. 4, 1911.

x 0 Q a UNITED STATES PATENT OFFICE.

J'AKOB ROHBER, OF MURI, NEAR BERNE, SWITZERLAND.

DEVICE FOR SOLDERING BAND-SAWS.

To all whom it may concern:

Be it known that I, J AKQB Ronnnn, a citizen of the Swiss Republic, andresident of Muri, near Berne, Switzerland, have invented certain new anduseful Improvements in Devices for Soldering Band-Saws, of which thefollowing is a specification.

This invention relates to a device for soldering band saws its objectbeing to provide a device of this kind which comprises two superposedclamping jaws of which the upper one is movable with reference to thelower one and which are arranged in such a manner that they are able toclamp together, during the soldering operation, the ends which it isdesired to solder together.

The clamping jaws proper are formed-of non metallic material which is abad conductor of heat and fire proof and are shaped in such a mannerthat they cover as little as possible the soldering seam and are heatedat the same time as the said soldering seam. WVhen the clamping jaws aretightened, the soldering seams are not cooled, but the solderingmaterial is uniformly distributed over the entire surface to be solderedand the soldering material (solder) which eventually would be introducedbetween the soldering seams is pressed out so that only that amount ofsoldering material is left between the surfaces to be soldered as isreally necessary for obtaining the connection. By using a non metallicfireproof material, a uniform and intensive heating of the solderingseam is obtained and the adhering of the soldering mass to the clampingjaws is avoided. This device has this advantage that the soldering seamsbecome much tougher and consequently last much longer than when thesoldering is carried out by hand or by means of other apparatuses.

In the accompanying drawings givenby way of example, Figure 1 shows oneform of embodiment of the device for soldering band saws, which formsthe subject matter of this invention. Fig. 2 is a section on line AB ofFig. 1.

a, a a and b, 6 b designate respectively three pins made of non metallicfire proof material preferably porcelain, between the opposite ends ofwhich the ends of the band saw which it is desired to solder togetherare clamped. The pins are secured in two iron members 0 and (1respectively,

Specification of Letters Patent.

Application filed December 16, 1909.

Patented Apr. 4, 1911.

Serial No. 533,341.

which are shaped so as to be adapted to receive the said pins. The lowermember is stationary while the upper one is hingedly secured by means ofthe hinge 6 with the lower one so that the clamping effect is producedby the pressure exerted on the upper member. The intervals left betweenthe said pins, leave suflicient free space for the soldering joint sothat the latter can be well obtained and acted upon by the solderingflame. The lower part (Z is provided with arms f and g projecting freelyin opposite directions and which are adapted to carry and guide the bandsaw.

Secured to each of the parts 0 and (l is a cap h and 2' respectivelyprovided on the inner side with a poor heat conducting material such asfor instance asbestos, the said caps inclosing the space surrounding thesoldering joint, but leaving free an opening for introducing thesoldering flame so that the heat of the latter is held together as muchas possible and is concentrated on the soldering joint.

The above described soldering device is employed in the followingmanner. The blade of the hand saw which it is desired to solder is forinstance chamfered on one side at each of its ends and the surfacesproduced by the chamfering operation are applied upon each other and thesolder is introduced between them while the blade of the saw rests onthe lower clamping member. When the upper clamping member is applied onthe ends of the saw blade, the said ends are held at the soldering jointso that the soldering operation can be carried out in a sure andcommodious manner.

I claim:

1. In a device for soldering band saws, the combination of two clampingmembers, one of the clamping members movably connected to the other,pins made of poor heat conducting material secured in each of saidmembers, the pins of each member being oppositely disposed to the pinsof the other member and adapted to form clampingjaws for securing theends of the saw-blade, and a cap fastened to each of said clampingmembers surrounding said pins.

2. In a device for soldering band saws, the combination of a lowerstationary clamping member, an upper clamping member hingedly connectedto the stationary member, pins made of poor heat conducting maand eachcap being lined on the inside with 10 a poor heat conducting material.

In testimony whereof I have hereunto set my hand in presence of tWOWitIIGSSQS.

JAKOB ROHRER.

terial secured in each of said members, the pins of each member beingarranged in rows and the pins of the upper member being oppositelydisposed to those of the station ary member and adapted to form clampingjaws for securing the ends of the saw-blade, a cap fastened to each ofsaid clamping members surrounding each row of pins to concentrate theheat of the soldering flame i Witnesses GEORGE Grrronn, HENRI ZANDT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

